C# 如何将RGB颜色更改为HSV？
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How to change RGB color to HSV?
提问by Tomasz Smykowski
How to change RGB color to HSV? In C# language. I search for very fast method without any external library.
如何将RGB颜色更改为HSV？在 C# 语言中。我在没有任何外部库的情况下搜索非常快速的方法。
采纳答案by georged
Have you considered simply using System.Drawing namespace? For example:
您是否考虑过简单地使用 System.Drawing 命名空间？例如：
System.Drawing.Color color = System.Drawing.Color.FromArgb(red, green, blue);
float hue = color.GetHue();
float saturation = color.GetSaturation();
float lightness = color.GetBrightness();
Note that it's not exactly what you've asked for (see differences between HSL and HSVand the Color class does not have a conversion back from HSL/HSV but the latter is reasonably easy to add.
请注意，这并不是您所要求的（请参阅HSL 和 HSV 之间的差异，并且Color 类没有从 HSL/HSV 转换回来，但后者相当容易添加.
回答by BlaM
There's a C implementation here:
这里有一个 C 实现：
http://www.cs.rit.edu/~ncs/color/t_convert.html
http://www.cs.rit.edu/~ncs/color/t_convert.html
Should be very straightforward to convert to C#, as almost no functions are called - just calculations.
转换为 C# 应该非常简单，因为几乎没有调用任何函数 - 只是计算。
found via Google
通过谷歌找到
回答by Captain Lepton
This is the VB.net version which works fine for me ported from the C code in BlaM's post.
这是从 BlaM 帖子中的 C 代码移植的 VB.net 版本，对我来说效果很好。
There's a C implementation here:
http://www.cs.rit.edu/~ncs/color/t_convert.html
Should be very straightforward to convert to C#, as almost no functions are called - just > calculations.
这里有一个 C 实现：
http://www.cs.rit.edu/~ncs/color/t_convert.html
转换为 C# 应该非常简单，因为几乎没有调用任何函数 - 只是 > 计算。
Public Sub HSVtoRGB(ByRef r As Double, ByRef g As Double, ByRef b As Double, ByVal h As Double, ByVal s As Double, ByVal v As Double)
Dim i As Integer
Dim f, p, q, t As Double
If (s = 0) Then
' achromatic (grey)
r = v
g = v
b = v
Exit Sub
End If
h /= 60 'sector 0 to 5
i = Math.Floor(h)
f = h - i 'factorial part of h
p = v * (1 - s)
q = v * (1 - s * f)
t = v * (1 - s * (1 - f))
Select Case (i)
Case 0
r = v
g = t
b = p
Exit Select
Case 1
r = q
g = v
b = p
Exit Select
Case 2
r = p
g = v
b = t
Exit Select
Case 3
r = p
g = q
b = v
Exit Select
Case 4
r = t
g = p
b = v
Exit Select
Case Else 'case 5:
r = v
g = p
b = q
Exit Select
End Select
End Sub
回答by Greg
Note that Color.GetSaturation()and Color.GetBrightness()return HSL values, not HSV.
The following code demonstrates the difference.
请注意，Color.GetSaturation()并Color.GetBrightness()返回 HSL 值，而不是 HSV。
以下代码演示了差异。
Color original = Color.FromArgb(50, 120, 200);
// original = {Name=ff3278c8, ARGB=(255, 50, 120, 200)}
double hue;
double saturation;
double value;
ColorToHSV(original, out hue, out saturation, out value);
// hue = 212.0
// saturation = 0.75
// value = 0.78431372549019607
Color copy = ColorFromHSV(hue, saturation, value);
// copy = {Name=ff3278c8, ARGB=(255, 50, 120, 200)}
// Compare that to the HSL values that the .NET framework provides:
original.GetHue(); // 212.0
original.GetSaturation(); // 0.6
original.GetBrightness(); // 0.490196079
The following C# code is what you want. It converts between RGB and HSV using the algorithms described on Wikipedia. The ranges are 0 - 360 for hue, and 0 - 1 for saturationor value.
以下 C# 代码正是您想要的。它使用Wikipedia 上描述的算法在 RGB 和 HSV 之间进行转换。范围是 0-360 表示hue，0-1 表示saturation或value。
public static void ColorToHSV(Color color, out double hue, out double saturation, out double value)
{
int max = Math.Max(color.R, Math.Max(color.G, color.B));
int min = Math.Min(color.R, Math.Min(color.G, color.B));
hue = color.GetHue();
saturation = (max == 0) ? 0 : 1d - (1d * min / max);
value = max / 255d;
}
public static Color ColorFromHSV(double hue, double saturation, double value)
{
int hi = Convert.ToInt32(Math.Floor(hue / 60)) % 6;
double f = hue / 60 - Math.Floor(hue / 60);
value = value * 255;
int v = Convert.ToInt32(value);
int p = Convert.ToInt32(value * (1 - saturation));
int q = Convert.ToInt32(value * (1 - f * saturation));
int t = Convert.ToInt32(value * (1 - (1 - f) * saturation));
if (hi == 0)
return Color.FromArgb(255, v, t, p);
else if (hi == 1)
return Color.FromArgb(255, q, v, p);
else if (hi == 2)
return Color.FromArgb(255, p, v, t);
else if (hi == 3)
return Color.FromArgb(255, p, q, v);
else if (hi == 4)
return Color.FromArgb(255, t, p, v);
else
return Color.FromArgb(255, v, p, q);
}
回答by David Pointer
The EasyRGBhas many color space conversions. Here is the codefor the RGB->HSV conversion.
回答by Matthias K.
FIRST: make sure you have a color as a bitmap, like this:
第一：确保你有一个颜色作为位图，像这样：
Bitmap bmp = (Bitmap)pictureBox1.Image.Clone();
paintcolor = bmp.GetPixel(e.X, e.Y);
(e is from the event handler wich picked my color!)
（e 来自选择我颜色的事件处理程序！）
What I did when I had this problem a whilke ago, I first got the rgba (red, green, blue and alpha) values. Next I created 3 floats: float hue, float saturation, float brightness. Then you simply do:
不久前我遇到这个问题时我做了什么，我首先得到了 rgba（红色、绿色、蓝色和 alpha）值。接下来我创建了 3 个浮点数：浮点色相、浮点饱和度、浮点亮度。然后您只需执行以下操作：
hue = yourcolor.Gethue;
saturation = yourcolor.GetSaturation;
brightness = yourcolor.GetBrightness;
The whole lot looks like this:
整体看起来是这样的：
Bitmap bmp = (Bitmap)pictureBox1.Image.Clone();
paintcolor = bmp.GetPixel(e.X, e.Y);
float hue;
float saturation;
float brightness;
hue = paintcolor.GetHue();
saturation = paintcolor.GetSaturation();
brightness = paintcolor.GetBrightness();
If you now want to display them in a label, just do:
如果您现在想在标签中显示它们，只需执行以下操作：
yourlabelname.Text = hue.ToString;
yourlabelname.Text = saturation.ToString;
yourlabelname.Text = brightness.ToString;
Here you go, you now have RGB Values into HSV values :)
在这里，您现在将 RGB 值转换为 HSV 值:)
Hope this helps
希望这可以帮助
